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<div class="title">src/contextFree/scanner/IndexedProduction.java</div>  </div>
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<div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="keyword">package </span>contextFree.scanner;
<a name="l00002"></a>00002 
<a name="l00003"></a>00003 
<a name="l00004"></a>00004 <span class="keyword">import</span> java.util.HashSet;
<a name="l00005"></a>00005 <span class="keyword">import</span> java.util.Set;
<a name="l00006"></a>00006 
<a name="l00007"></a>00007 <span class="keyword">import</span> contextFree.grammar.Production;
<a name="l00008"></a>00008 
<a name="l00009"></a>00009 
<a name="l00010"></a><a class="code" href="classcontext_free_1_1scanner_1_1_indexed_production.html">00010</a> <span class="keyword">public</span> <span class="keyword">class </span><a class="code" href="classcontext_free_1_1scanner_1_1_indexed_production.html">IndexedProduction</a> <span class="keyword">extends</span> <a class="code" href="classcontext_free_1_1grammar_1_1_production.html">Production</a>{
<a name="l00011"></a>00011         <span class="keyword">private</span> <span class="keywordtype">int</span> currentCharIndex;
<a name="l00012"></a>00012         <span class="keyword">private</span> Set&lt;String&gt; lookahead;
<a name="l00013"></a>00013         
<a name="l00014"></a>00014         <span class="keyword">public</span> <a class="code" href="classcontext_free_1_1scanner_1_1_indexed_production.html">IndexedProduction</a>(){
<a name="l00015"></a>00015                 super();
<a name="l00016"></a>00016                 currentCharIndex=0;
<a name="l00017"></a>00017                 lookahead = <span class="keyword">new</span> HashSet&lt;String&gt;();
<a name="l00018"></a>00018         }
<a name="l00019"></a>00019         
<a name="l00020"></a>00020         
<a name="l00021"></a>00021         <span class="keyword">public</span> <a class="code" href="classcontext_free_1_1scanner_1_1_indexed_production.html">IndexedProduction</a>(<a class="code" href="classcontext_free_1_1scanner_1_1_indexed_production.html">IndexedProduction</a> pro){
<a name="l00022"></a>00022                 super(pro.<a class="code" href="classcontext_free_1_1grammar_1_1_production.html#aff0ed3fbde7f7a476a993936c27ddef7">getLeftSimbols</a>(),pro.getRightSimbols());
<a name="l00023"></a>00023                 currentCharIndex=pro.getCurrentCharIndex();
<a name="l00024"></a>00024                 lookahead=pro.<a class="code" href="classcontext_free_1_1scanner_1_1_indexed_production.html#a45b191078f89a67427a2593b67ae4f1e">getLookahead</a>();
<a name="l00025"></a>00025                 <span class="keywordflow">if</span> (lookahead==null)
<a name="l00026"></a>00026                         lookahead = <span class="keyword">new</span> HashSet&lt;String&gt;();
<a name="l00027"></a>00027 
<a name="l00028"></a>00028         }
<a name="l00029"></a>00029         
<a name="l00030"></a>00030         <span class="keyword">public</span> <a class="code" href="classcontext_free_1_1scanner_1_1_indexed_production.html">IndexedProduction</a>(<a class="code" href="classcontext_free_1_1grammar_1_1_production.html">Production</a> p){
<a name="l00031"></a>00031                 super(p.<a class="code" href="classcontext_free_1_1grammar_1_1_production.html#aff0ed3fbde7f7a476a993936c27ddef7">getLeftSimbols</a>(),p.getRightSimbols());
<a name="l00032"></a>00032                 currentCharIndex=0;
<a name="l00033"></a>00033                 lookahead = <span class="keyword">new</span> HashSet&lt;String&gt;();
<a name="l00034"></a>00034 
<a name="l00035"></a>00035         }
<a name="l00036"></a>00036         
<a name="l00037"></a>00037         <span class="keyword">public</span> <a class="code" href="classcontext_free_1_1scanner_1_1_indexed_production.html">IndexedProduction</a>(<span class="keywordtype">int</span> i, <a class="code" href="classcontext_free_1_1grammar_1_1_production.html">Production</a> p){
<a name="l00038"></a>00038                 super(p.<a class="code" href="classcontext_free_1_1grammar_1_1_production.html#aff0ed3fbde7f7a476a993936c27ddef7">getLeftSimbols</a>(),p.getRightSimbols());
<a name="l00039"></a>00039                 currentCharIndex=i;
<a name="l00040"></a>00040                 lookahead = <span class="keyword">new</span> HashSet&lt;String&gt;();
<a name="l00041"></a>00041         }
<a name="l00042"></a>00042         
<a name="l00043"></a>00043         
<a name="l00044"></a>00044         <span class="keyword">public</span> <a class="code" href="classcontext_free_1_1scanner_1_1_indexed_production.html">IndexedProduction</a>(<span class="keywordtype">int</span> i, <a class="code" href="classcontext_free_1_1grammar_1_1_production.html">Production</a> p, String la){
<a name="l00045"></a>00045                 super(p.<a class="code" href="classcontext_free_1_1grammar_1_1_production.html#aff0ed3fbde7f7a476a993936c27ddef7">getLeftSimbols</a>(),p.getRightSimbols());
<a name="l00046"></a>00046                 currentCharIndex=i;
<a name="l00047"></a>00047                 <span class="comment">//controlliamo se Lookahead � vuoto ed eventualmente inizializziamo tale insieme prima di inserire elementi</span>
<a name="l00048"></a>00048                 <span class="keywordflow">if</span>(lookahead==null)
<a name="l00049"></a>00049                         lookahead = <span class="keyword">new</span> HashSet&lt;String&gt;();
<a name="l00050"></a>00050                 <span class="comment">//aggiungo ttutti gli elementi conntenuti in la</span>
<a name="l00051"></a>00051                 lookahead.add(la);
<a name="l00052"></a>00052         }
<a name="l00053"></a>00053         
<a name="l00054"></a>00054         
<a name="l00055"></a>00055         <span class="keyword">public</span> <a class="code" href="classcontext_free_1_1scanner_1_1_indexed_production.html">IndexedProduction</a>(<a class="code" href="classcontext_free_1_1grammar_1_1_production.html">Production</a> p, Set&lt;String&gt; la){
<a name="l00056"></a>00056                 super(p.<a class="code" href="classcontext_free_1_1grammar_1_1_production.html#aff0ed3fbde7f7a476a993936c27ddef7">getLeftSimbols</a>(),p.getRightSimbols());
<a name="l00057"></a>00057                 currentCharIndex=0;
<a name="l00058"></a>00058                 <span class="comment">//controlliamo se Lookahead � vuoto ed eventualmente inizializziamo tale insieme prima di inserire elementis</span>
<a name="l00059"></a>00059                 <span class="keywordflow">if</span>(lookahead==null)
<a name="l00060"></a>00060                         lookahead = <span class="keyword">new</span> HashSet&lt;String&gt;();
<a name="l00061"></a>00061                 <span class="comment">//aggiungo ttutti gli elementi conntenuti in la</span>
<a name="l00062"></a>00062                 lookahead.addAll(la);
<a name="l00063"></a>00063         }
<a name="l00064"></a>00064         
<a name="l00065"></a>00065         
<a name="l00066"></a>00066         <span class="keyword">public</span> <span class="keywordtype">int</span> getCurrentCharIndex() {
<a name="l00067"></a>00067                 <span class="keywordflow">return</span> currentCharIndex;
<a name="l00068"></a>00068         }
<a name="l00069"></a>00069         
<a name="l00074"></a><a class="code" href="classcontext_free_1_1scanner_1_1_indexed_production.html#a732f8fa87c6841cba382c88a6a6c30a5">00074</a>         <span class="keyword">public</span> String <a class="code" href="classcontext_free_1_1scanner_1_1_indexed_production.html#a732f8fa87c6841cba382c88a6a6c30a5" title="Return the next symbol that that will be read.">getCharAfter</a>(){
<a name="l00075"></a>00075                 <span class="keywordflow">try</span>{
<a name="l00076"></a>00076                         <span class="keywordflow">return</span> getRightSimbols().get(currentCharIndex);
<a name="l00077"></a>00077                 }<span class="keywordflow">catch</span> (Exception e) {
<a name="l00078"></a>00078                         <span class="keywordflow">return</span> null;
<a name="l00079"></a>00079                 }
<a name="l00080"></a>00080         }
<a name="l00081"></a>00081         
<a name="l00082"></a>00082         <span class="keyword">public</span> String getCharBefore(){
<a name="l00083"></a>00083                 <span class="keywordflow">try</span>{
<a name="l00084"></a>00084                         <span class="keywordflow">return</span> getRightSimbols().get(currentCharIndex-1);
<a name="l00085"></a>00085                 }<span class="keywordflow">catch</span> (Exception e) {
<a name="l00086"></a>00086                         <span class="keywordflow">return</span> null;
<a name="l00087"></a>00087                 }
<a name="l00088"></a>00088                 
<a name="l00089"></a>00089         }
<a name="l00090"></a>00090 
<a name="l00091"></a>00091         <span class="keyword">public</span> <span class="keywordtype">void</span> setCurrentCharIndex(<span class="keywordtype">int</span> currentCharIndex) {
<a name="l00092"></a>00092                 this.currentCharIndex = currentCharIndex;
<a name="l00093"></a>00093         }
<a name="l00094"></a>00094 
<a name="l00099"></a><a class="code" href="classcontext_free_1_1scanner_1_1_indexed_production.html#a45b191078f89a67427a2593b67ae4f1e">00099</a>         <span class="keyword">public</span> Set&lt;String&gt; <a class="code" href="classcontext_free_1_1scanner_1_1_indexed_production.html#a45b191078f89a67427a2593b67ae4f1e">getLookahead</a>() {
<a name="l00100"></a>00100                 <span class="keywordflow">return</span> lookahead;
<a name="l00101"></a>00101         }
<a name="l00102"></a>00102 
<a name="l00108"></a><a class="code" href="classcontext_free_1_1scanner_1_1_indexed_production.html#a8346f298c18af8ce2f48442a12b3a123">00108</a>         <span class="keyword">public</span> <span class="keywordtype">boolean</span> <a class="code" href="classcontext_free_1_1scanner_1_1_indexed_production.html#a8346f298c18af8ce2f48442a12b3a123" title="Compare to production without the dot.">compare</a>(<a class="code" href="classcontext_free_1_1scanner_1_1_indexed_production.html">IndexedProduction</a> p){
<a name="l00109"></a>00109                 <span class="keywordflow">if</span>( p.<a class="code" href="classcontext_free_1_1grammar_1_1_production.html#aff0ed3fbde7f7a476a993936c27ddef7">getLeftSimbols</a>().equals(<a class="code" href="classcontext_free_1_1grammar_1_1_production.html#aff0ed3fbde7f7a476a993936c27ddef7">getLeftSimbols</a>())
<a name="l00110"></a>00110                                         &amp;&amp; 
<a name="l00111"></a>00111                         p.getRightSimbols().equals(getRightSimbols())
<a name="l00112"></a>00112                         ) <span class="keywordflow">return</span> <span class="keyword">true</span>;
<a name="l00113"></a>00113                 <span class="keywordflow">else</span> <span class="keywordflow">return</span> <span class="keyword">false</span>;
<a name="l00114"></a>00114         }
<a name="l00115"></a>00115         
<a name="l00116"></a>00116         @Override
<a name="l00117"></a><a class="code" href="classcontext_free_1_1scanner_1_1_indexed_production.html#a445e1ce3ced2a3b4e1157bd682f973a6">00117</a>         <span class="keyword">public</span> String <a class="code" href="classcontext_free_1_1scanner_1_1_indexed_production.html#a445e1ce3ced2a3b4e1157bd682f973a6" title="return a formatted string in the form axioms :: = expression">toString</a>(){
<a name="l00118"></a>00118                 String right = super.getRight();
<a name="l00119"></a>00119                 <span class="keywordflow">if</span>(right.equals(<span class="stringliteral">&quot; &quot;</span>)) <span class="keywordflow">return</span> super.getLeft()+<span class="stringliteral">&quot;-&gt;eps&quot;</span>;
<a name="l00120"></a>00120                 <span class="keywordflow">return</span> super.getLeft()+<span class="stringliteral">&quot;-&gt;&quot;</span>+ right.substring(0,currentCharIndex) + <span class="stringliteral">&quot;.&quot;</span> +right.substring(currentCharIndex, right.length()) + lookahead;
<a name="l00121"></a>00121 <span class="comment">//              for(String l : lookahead){</span>
<a name="l00122"></a>00122 <span class="comment">//                      result += l + &quot;  &quot;;</span>
<a name="l00123"></a>00123 <span class="comment">//              }</span>
<a name="l00124"></a>00124 <span class="comment">//              return result +&quot;}&quot;;</span>
<a name="l00125"></a>00125         }
<a name="l00126"></a>00126 
<a name="l00127"></a>00127 
<a name="l00128"></a>00128         <span class="keyword">public</span> <span class="keywordtype">boolean</span> addLookahead(Set&lt;String&gt; lookahead2) {
<a name="l00129"></a>00129                 <span class="keywordflow">return</span> this.lookahead.addAll(lookahead2);
<a name="l00130"></a>00130         }
<a name="l00131"></a>00131         
<a name="l00132"></a>00132 }
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